National security refers to something that is relatively free from danger and internal and external threats.

National security means that national power, sovereignty, unity and territorial integrity are relatively free from danger and internal and external threats.

National security refers to the ability of people's well-being, sustainable economic and social development and other major national interests to be relatively free from dangers and internal and external threats, and to ensure a continuous state of security. National security is the foundation of national rejuvenation, and a good external security environment is the foundation for the prosperity and long-term stability of the party and the country.

Contemporary national security includes 16 basic contents: political security, homeland security, military security, economic security, cultural security, social security, scientific and technological security, network security, ecological security, resource security, nuclear security, overseas interests security, biological security, space security, polar security and deep-sea security.

Traditional security has existed since ancient times, mainly including political security and military security, and has long been equated with national security. Traditional security threats generally refer to external threats to national sovereign independence and territorial integrity. Some scholars believe that traditional security threats can be divided into three categories according to the degree of threat: arms race, military threat and war.

Principles of national security:

1, adhere to the leadership of the China * * * production party on national security work, and establish a centralized, unified, efficient and authoritative national security leadership system. The central national security leading body (the Central National Security Council) is responsible for the decision-making and deliberation and coordination of national security work, studying, formulating and guiding the implementation of national security strategies and relevant major principles and policies, coordinating major national security issues and important work, and promoting the construction of the rule of law in national security.

2. Adhere to the principle of rule of law and protection of human rights. Safeguard the constitutional system, strengthen the constraints on the exercise of public power by state organs and their staff, and safeguard the main position, dignity, freedom and interests of organizations, citizens and legal persons.

3. Adhere to the coordination between national security and economic and social development, and make overall plans for security in all fields. It is necessary to coordinate security and development, continuously improve national security capabilities and promote national security through development. By constantly improving the ability to safeguard national security, we will provide a stable environment for development and realize the mutual support and benign interaction between sustainable development and sustainable security.